Definition of bagworm
: any of a family (Psychidae) of moths with wingless females and plant-feeding larvae that live in a silk case covered with plant debris
especially
: one (Thyridopteryx ephemeraeformis) often destructive to deciduous and evergreen trees of the eastern U.S.
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Merriam-Webster unabridged
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Time Traveler for bagworm
The first known use of bagworm was in 1811
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